Powershell error when deleting old files and folders - powershell

Question

I'm trying to delete some old files in an archive folder and my script works fine until it gets to the last section where it removes the empty folders (testing using -whatif initially). I get the following error:
Remove-Item : Cannot bind argument to parameter 'Path' because it is null.
At C:\ArchiveDelete.ps1:13 char:39
+ $dirs | Foreach-Object { Remove-Item <<<< $_.fullname -whatif }
+ CategoryInfo : InvalidData: (:) [Remove-Item], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.RemoveItemCommand
Tried to find a suitable answer on here but can't find a solution (I know I may be using an older version of Powershell)
#Days older than
$HowOld = -900
#Path to the root folder
$Path = "C:\SharedWorkspace\ArchiveDSAgile"
#Deletion files task
get-childitem $Path -recurse | where {$_.lastwritetime -lt (get-date).adddays($HowOld) -and -not $_.psiscontainer} |% {remove-item $_.fullname -force -whatif}
#Deletion empty folders task
do {
$dirs = gci $Path -recurse | Where { (gci $_.fullName -Force).count -eq 0 -and $_.PSIsContainer } | select -expandproperty FullName
$dirs | Foreach-Object { Remove-Item $_ -whatif }
} while ($dirs.count -gt 0)

Answer 1

None of your loops are necessary.
You can feed the output of Where-Object right into Remove-Item
$AgeCap = (Get-Date).AddDays(-900)
$Path = "C:\SharedWorkspace\ArchiveDSAgile"
Get-ChildItem $Path -Recurse -File | Where-Object LastWriteTime -lt $AgeCap | Remove-Item -WhatIf
The -File parameter for Get-ChildItem available in PowerShell 3.0 (I believe) and higher. The Workaround for PowerShell 2.0 would be checking against $_.PSIsContainer in Where-Object, as you did in your sample code.

Answer 2

Finally got it working:
#Days older than
$HowOld = -900
#Path to the root folder
$Path = "C:\SharedWorkspace\ArchiveDSAgile"
#Deletion files task
get-childitem $Path -recurse | where {$_.lastwritetime -lt (get-date).adddays($HowOld) -and -not $_.psiscontainer} |% {remove-item $_.fullname -force -whatif}
#Deletion empty folders task
Get-ChildItem $Path -Recurse | Where-Object {$_.lastwritetime -lt (get-date).adddays($HowOld) -and -not !$_.psiscontainer} | Remove-Item -recurse -WhatIf
Thanks for your help